linux-kernel - Re: [PATCH V4 0/4] mm/memory_hotplug: Pre-validate the address range with platform

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Message-ID: <fb18a191-4c65-faf8-29ee-780a6c1ab55e@redhat.com>
Date:   Mon, 25 Jan 2021 10:53:27 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org,
        akpm@...ux-foundation.org, hca@...ux.ibm.com,
        catalin.marinas@....com
Cc:     Oscar Salvador <osalvador@...e.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Will Deacon <will@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 0/4] mm/memory_hotplug: Pre-validate the address range
 with platform

On 25.01.21 10:52, Anshuman Khandual wrote:
> 
> 
> On 1/25/21 2:55 PM, David Hildenbrand wrote:
>> On 25.01.21 03:58, Anshuman Khandual wrote:
>>> This series adds a mechanism allowing platforms to weigh in and prevalidate
>>> incoming address range before proceeding further with the memory hotplug.
>>> This helps prevent potential platform errors for the given address range,
>>> down the hotplug call chain, which inevitably fails the hotplug itself.
>>>
>>> This mechanism was suggested by David Hildenbrand during another discussion
>>> with respect to a memory hotplug fix on arm64 platform.
>>>
>>> https://lore.kernel.org/linux-arm-kernel/1600332402-30123-1-git-send-email-anshuman.khandual@arm.com/
>>>
>>> This mechanism focuses on the addressibility aspect and not [sub] section
>>> alignment aspect. Hence check_hotplug_memory_range() and check_pfn_span()
>>> have been left unchanged. Wondering if all these can still be unified in
>>> an expanded memhp_range_allowed() check, that can be called from multiple
>>> memory hot add and remove paths.
>>>
>>> This series applies on v5.11-rc5 and has been tested on arm64. But only
>>> build tested on s390.
>>>
>>
>> Note that this fails to apply right now to both, -next and Linus' tree.
>> Do you have a branch with he patches on top I can use for a quick test?
>> Thanks
>>
> 
> Applied all four patches on v5.11-rc5.
> 
> https://gitlab.arm.com/linux-arm/linux-anshuman/-/tree/mm/hotplug_callback/v4/
> 

Ah, my fault, they do apply directly on v5.11-rc5 (not sure what I
messed up jumping between branches - thanks!). Will give it a test.

-- 
Thanks,

David / dhildenb